Great work with the plugin! Very good-looking and supple.
Though, I have some problems with it. I don't think they are related so I put them in two different threads.
The first one is that the required fields doesn't work. I tried to leave a required field blank and the form didn't give me an error message when I submitted it. I also tried to write something without a @-sign in the email address field and the form let that pass too.
My settings are the default settings, and I have tried both to include scripts in footer and in the shortcode; neither of them works.
Page where the malfunctioning form is shown: http://frimodigkyrka.se/ny/medlem/